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| author | Thomas Gleixner <tglx@linutronix.de> | 2013-02-20 14:06:20 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-02-20 14:06:20 -0500 |
| commit | 1cba0cdf5e4dbcd9e5fa5b54d7a028e55e2ca057 (patch) | |
| tree | 7fb357815f9c0322ef7bee34772533a0342e5737 | |
| parent | e942f883bc6651d50be139477baf6fb0eed3d5bb (diff) | |
| download | linux-stable-1cba0cdf5e4dbcd9e5fa5b54d7a028e55e2ca057.tar.gz linux-stable-1cba0cdf5e4dbcd9e5fa5b54d7a028e55e2ca057.tar.bz2 linux-stable-1cba0cdf5e4dbcd9e5fa5b54d7a028e55e2ca057.zip | |
btrfs: Init io_lock after cloning btrfs device struct
__btrfs_close_devices() clones btrfs device structs with
memcpy(). Some of the fields in the clone are reinitialized, but it's
missing to init io_lock. In mainline this goes unnoticed, but on RT it
leaves the plist pointing to the original about to be freed lock
struct.
Initialize io_lock after cloning, so no references to the original
struct are left.
Reported-and-tested-by: Mike Galbraith <efault@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
| -rw-r--r-- | fs/btrfs/volumes.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 7992dc4ea4cc..5d6010ba8b7e 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -650,6 +650,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) new_device->writeable = 0; new_device->in_fs_metadata = 0; new_device->can_discard = 0; + spin_lock_init(&new_device->io_lock); list_replace_rcu(&device->dev_list, &new_device->dev_list); call_rcu(&device->rcu, free_device); |